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Charging circuit

A charging circuit and circuit technology, applied in battery circuit devices, circuit devices, current collectors, etc., can solve problems such as energy consumption of storage elements, and achieve the effect of suppressing power consumption and reducing size

Inactive Publication Date: 2004-04-28
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in the above method, it is necessary to drive the operational amplifier with the charged storage element
Therefore, the energy of the storage element is consumed in order to drive the operational amplifier when not charging, and there is a problem in driving with extremely low power.

Method used

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Examples

Experimental program
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Embodiment Construction

[0038] figure 1 It is a circuit configuration diagram showing the charging circuit 3 in the preferred embodiment of the present invention.

[0039] figure 1 The charging circuit 3 shown is composed of an electric storage element 2 , a constant voltage circuit 10 , a differential amplifier 20 , a switching device 29 , and a photovoltaic power generation element 30 . Furthermore, in figure 1 Here, the positive side of the storage element 2 is set as the reference potential 1, and the negative side is set as the power supply potential.

[0040] exist figure 1 In this case, a lithium ion storage battery is used as the storage element 2 . In addition, the constant voltage circuit 10, the differential amplifier circuit 20, and the switching element 29 are constituted by MOSFETs.

[0041] The photovoltaic power generation element 30 has a PN structure in which a P-type semiconductor and an N-type semiconductor are joined, and when light is irradiated there, electricity is ge...

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PUM

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Abstract

Charging a storage cell requires the electromotive force exerted at a photogenerating cell in addition to the voltage equal to or higher than the forward on voltage developed at an backflow preventing diode. Therefore, the charging is inefficient. Moreover, the area of the backflow preventing diode must be large in consideration for a current supply from the photogenerating cell at a high intensity of illumination. A charging circuit, constructed using a differential amplifier, which has a power supply therefor separated from another power supply, is used as a direction-of-current detecting circuit that detects the direction of current from a voltage difference between two different power supplies. Consequently, a switch is logically turned on or off depending on whether charging or non-charging is under way. Thus, on voltage to be developed during charging is lowered. Moreover, the size or area of a transistor that acts as a logical circuit is made smaller than that of the backflow preventing diode. Furthermore, the energy of a storage cell included in the charging circuit is hardly consumed in any states.

Description

technical field [0001] The invention relates to a charging circuit for high-efficiency charging by detecting the current direction according to the voltage difference of two different power sources. Background technique [0002] known as Figure 6 The shown charging circuit 6 uses two different power sources of the storage element 2 and the photovoltaic element 30 , and a backflow prevention diode 40 . [0003] The charging circuit 6 drives the drive circuit 5 via the power storage element 2 . When the voltage generated by the photovoltaic power generation element 30 is higher than the voltage of the power storage element 2 , the power storage element 2 can be charged by the photovoltaic power generation element 30 . The positive side of the charging circuit 6 is used as a reference potential 1, and the negative side is used as a power supply potential. [0004] The photovoltaic element 30 has a PN structure in which a P-type semiconductor and an N-type semiconductor are j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04C10/00H02J7/35
CPCH02J7/35G04C10/00Y02E10/566Y02E10/56
Inventor 相原克好野崎孝明岩仓良树
Owner CITIZEN WATCH CO LTD